To avoid voltage drops when splitting the signal, the resistor at the output should be before the feedback, and 1K is the appropriate value.

You could solder the voltage divider's resistors in the rotary switch to simplify the PCB and the wiring to the front panel

You could save the trimmer resistor in the op-amp feedback matching the resistors to 0.1%. This would give you a worst case deviation gain of 0.002. For 5V at the input it would be -5.01V at the output that it is worst case error of about 1/17 tone.

It is recommendable to use a voltage reference instead of use the power rail directly._________________electronic-sea.net

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